CN101680967B - Lens and optical unit using the same - Google Patents

Abstract

The purpose of the invention is to provide a lens having low birefringence and high refraction, while being excellent in transparency and heat resistance. Also disclosed is an optical unit using such a lens. Specifically disclosed is a lens made of a polycarbonate copolymer (I) which is composed of a unit (A) represented by the formula (A) below and a unit (B) represented by the formula (B) below. In this polycarbonate copolymer (I), the ratio of unit (A) in all the units is 50-80 mol%. Also specifically disclosed is an optical unit using such a lens. In the formula (A), R1-R4 independently represent a hydrogen atom, a hydrocarbon group having 1-9 carbon atoms, or a halogen atom. In the formula (B), R5 and R6 independently represent a hydrogen atom or the like; and R7 and R8 independently represent a hydrogen atom or an alkyl group having 1-9 carbon atoms. In this connection, the total number of carbon atoms in R7 and R8 is 9 or 10.

Description

Lens and the optical unit that uses these lens

Technical field

The present invention relates to lens of processing by Copolycarbonate and the optical unit that comprises these lens.Specifically, lens of processing by Copolycarbonate that relate to that birefringence is minimum, the transparency is excellent and optical unit with these lens.

Background technology

Polymethylmethacrylate has the good transparency and low-birefringence characteristic, uses in a large number as the optical material of lens, LGP etc.But in recent years from the densification of electronic equipment, the viewpoint of security, requiring that the thermotolerance of resin improves is surging, is difficult to polymethylmethacrylate and has sufficient thermotolerance.

On the other hand, from the polycarbonate of bisphenol-A, the transparency, thermotolerance, mechanical property, excellent in dimensional stability are representative with the optical material, in various uses, utilize.But from the polycarbonate of bisphenol-A, the birefringence that is produced by the orientation of strand is big, and the optical skew that the residual stress during by moulding produces is also big, therefore in requiring the lens of optical accuracy, uses and remarkable.

Birefringent method as improving polycarbonate has proposed the method (patent documentation 1,2) with phenylethylene resin series graft copolymerization.But the physical strength of the graft copolymer of polycarbonate and phenylethylene resin series is low, and is extremely crisp.In addition, because poor heat stability, difficult forming in order to improve physical strength, needs to improve molecular weight.But if improve molecular weight, then mouldability, surface accuracy variation have the shortcoming that can't obtain practical lens.

As the method for improving this respect, having proposed will be from the polycarbonate and the acrylonitritrile-styrene resin method of mixing (patent documentation 3) of two (4-hydroxyl-3,5-3,5-dimethylphenyl) propane.But, though this resin combination has improved the transparency, birefringence, exist thermal stability low, moulding is the shortcoming of difficulty very.

On the other hand, proposed excellent heat resistance, the Copolycarbonate that comprises fluorene skeleton with high index of refraction is used for lens (patent documentation 4).But this Copolycarbonate has the high shortcoming of birefringence.

On the other hand, proposed to have used the Copolycarbonate that comprises fluorene skeleton, and the CD (patent documentation 5 and 6) that is improved of the distortion when water absorptivity, high speed rotating.

In addition, as the optical unit that constitutes by a plurality of lens, proposed through the plastic lens that will process by the ester ring type polyolefin and the incompatible correction chromatic aberation of processing by the Copolycarbonate that comprises fluorene skeleton of lens combination (patent documentation 7).But,,, exist in birefringence and reach minimum regional glass transition temperature rising, the shortcoming of mouldability variation though increase the then birefringence reduction of content of fluorene skeleton for this Copolycarbonate.

Patent documentation 1: japanese kokai publication sho 61-19630 communique

Patent documentation 2: japanese kokai publication sho 63-15822 communique

Patent documentation 3: japanese kokai publication hei 05-027101 communique

Patent documentation 4: japanese kokai publication hei 06-018701 communique

Patent documentation 5: TOHKEMY 2005-272691 communique

Patent documentation 6: TOHKEMY 2006-328106 communique

Patent documentation 7: TOHKEMY 2005-309109 communique

Summary of the invention

The object of the present invention is to provide the lens that birefringence is little, have high index of refraction.In addition, the object of the present invention is to provide the lens of the transparency and excellent heat resistance.In addition, the object of the present invention is to provide chromatic aberation to obtain revising, have the optical unit of high-resolution.

The inventor finds: the birefringence of the alkylene moiety of bisphenol-A having been carried out the Copolycarbonate (I) that the unit (B) of modification constitutes by the unit that contains the fluorenes ring (A) with chain alkyl is minimum, and refractive index is high.Find in addition: Copolycarbonate (I) even with 50～80 moles of % such contain unit (A) at high proportion, melt viscosity is also low, moulding easily is extremely excellent as the starting material of lens.In addition, also distinguish since Copolycarbonate (I) containing the fluorenes ring at high proportion, so excellent heat resistance.

Find in addition: the Abbe number of the lens of being processed by Copolycarbonate (I) is about 20～30, if with Abbe number be 45～60 combination of lenses, can access chromatic aberation and obtain revising, have the optical unit of high-resolution.The present invention is based on these opinions and accomplish.

Promptly; The present invention relates to lens; It is processed by Copolycarbonate (I) (the following PC (I) that abbreviates as sometimes), and the unit (B) that unit (A) that this Copolycarbonate (I) is represented by following formula and following formula are represented constitutes, and all the ratio of the unit (A) in the unit is 50～80 moles of %.

(in the formula, R ¹～R ⁴Independently of one another for hydrogen atom, can contain the alkyl or the halogen atom of the carbon number 1～9 of aromatic group.)

(in the formula, R ⁵, R ⁶Represent the alkyl of hydrogen atom, carbon number 1～6, the aryl of carbon number 6～10 or the alkoxy of carbon number 1～6 independently of one another.R ⁷And R ⁸The alkyl of representing hydrogen atom or carbon number 1～9 independently of one another.Wherein, R ⁷And R ⁸Carbon number add up to 9 or 10.)

In addition, the present invention comprises optical unit, and it is 45～60 plastic lens that this optical unit contains said lens and Abbe number.

Description of drawings

Fig. 1 is that expression is with the sketch of support with the incorporate optical unit of lens.

Fig. 2 is the evaluation system of the exploring degree of optical unit.

Symbol description

1: the 1 lens

2: the 2 lens

3: the 1 supports

4: the 2 supports

5: the composition surface

6: optical axis

7: lens unit

The 8:MTF determination unit

9: personal computer

10: video output

11: estimate and use image

Embodiment

Below the present invention is elaborated.

< Copolycarbonate (I): PC (I) >

(unit (A))

PC (I) has the unit (A) that following formula is represented.

R in the unit (A) ¹, R ², R ³And R ⁴Be the alkyl or the halogen atom of hydrogen atom, carbon number 1～9 independently of one another.As the alkyl of carbon number 1～9, can enumerate the alkyl of carbon number 1～9, the aryl of carbon number 6～12.As alkyl, can enumerate methyl, ethyl, propyl group, butyl, hexyl, octyl group etc.As aryl, can enumerate phenyl, naphthyl etc.As halogen atom, can enumerate fluorine atom, chlorine atom, bromine atoms etc.R ¹, R ², R ³And R ⁴Preferred is the alkyl or phenyl of hydrogen atom, carbon number 1～3 independently of one another.

As the concrete example of preferred unit (A), can enumerate by 9 two (the 4-hydroxy-3-methyl phenyl) fluorenes, 9 of 9-, two (4-hydroxyl-3-ethylphenyl) fluorenes and 9 of 9-, the unit that two (the 4-hydroxy-2-methyl phenyl) fluorenes etc. of 9-are derived.

(unit (B))

PC (I) has the unit (B) that following formula is represented.

In the unit (B), R ⁵, R ⁶Represent the alkyl of hydrogen atom, carbon number 1～6, the aryl of carbon number 6～10 or the alkoxy of carbon number 1～6 independently of one another.As the alkyl of carbon number 1～6, can enumerate methyl, ethyl, propyl group, butyl, hexyl etc.As the aryl of carbon number 6～10, can enumerate phenyl, naphthyl etc.As the alkoxy of carbon number 1～6, can enumerate methoxyl, ethoxy, propoxyl group, butoxy, own oxygen base etc.

R ⁷And R ⁸The alkyl of representing hydrogen atom or carbon number 1～9 independently of one another.Wherein, R ⁷And R ⁸Carbon number add up to 9 or 10.As the alkyl of carbon number 1～9, can enumerate methyl, ethyl, propyl group, butyl, hexyl, octyl group etc.

As unit (B), preferred R ⁵, R ⁶Unit for hydrogen atom.As unit (B), can enumerate by 1 two (4-hydroxy phenyl) decane, 1 of 1-, two (3-methyl-4-hydroxy phenyl) decane, 1 of 1-, the unit that two (2, the 3-dimethyl-4-hydroxy phenyl) decane of 1-are derived.

For PC (I), preferred cell (A) is by 9, the unit that two (the 4-hydroxy-3-methyl phenyl) fluorenes of 9-are derived, and unit (B) is by 1, the unit that two (4-hydroxy phenyl) decane of 1-are derived.

In addition, all the ratio of the unit (A) in the unit is preferably 50～80 moles of %, and more preferably 55～75 moles of % further are preferably 65～75 moles of %.The ratio of unit (A) is during less than 50 moles of %, and glass transition temperature reduces, and mouldability improves, but intrinsic birefringent absolute value increases the birefringence increase with photoelastic coefficient.In addition, when the ratio of unit (A) surpassed 80 moles of %, though photoelastic coefficient diminishes, it is big that the absolute value of intrinsic birefringence value becomes, so birefringence as a result becomes big.In addition, because glass transition temperature increases, in the time of therefore will processing lens, mouldability is not enough.Unit (A) is different with the sign symbol of the intrinsic birefringence value of unit (B), through they the coexistence, can reduce result from the orientation birefringence.

(manufacturing approach of PC (I))

PC (I) can make the dihydric phenol of derived units (A) and the dihydric phenol and the carbonate precursor reaction of derived units (B) through adopting solution polymerization process or melt phase polycondensation.PC (I) preferably adopts solution polymerization process, is the interfacial polymerization manufactured.Above-mentioned two kinds of dihydric phenols can react with carbonate precursor simultaneously, also can every kind of reaction successively.

Only otherwise infringement the object of the invention and characteristic, can be with 10 moles of ratio, preferred 5 moles of unit that the ratio copolymerization below the % is derived by other dihydric phenols below the %.As the typical example of these other dihydric phenols, can enumerate p-dihydroxy-benzene, resorcinol, 4,4 '-dihydroxybiphenyl, two (4-hydroxy phenyl) methane, two { (4-hydroxyl-3,5-dimethyl) phenyl } methane, 1; Two (4-hydroxy phenyl) ethane, 1 of 1-, two (4-the hydroxy phenyl)-1-diphenylphosphino ethanes, 2 of 1-, two (4-hydroxy phenyl) propane (bisphenol-A), 2 of 2-, two { (4-hydroxy-3-methyl) phenyl } propane, 2 of 2-; Two { (4-hydroxyl-3, the 5-dimethyl) phenyl } propane, 2 of 2-, two { (3, the 5-two bromo-4-hydroxyls) phenyl } propane, 2 of 2-; Two { (3-isopropyl-4-hydroxyl) phenyl } propane, 2 of 2-, two { (4-hydroxyl-3-phenyl) phenyl } propane, 2 of 2-, two (4-hydroxy phenyl) butane, 2 of 2-, two (4-the hydroxy phenyl)-3-methylbutanes, 2 of 2-; Two (the 4-hydroxy phenyls)-3 of 2-, 3-dimethylbutane, 2, two (4-the hydroxy phenyl)-2-methylbutanes, 2 of 4-, two (4-hydroxy phenyl) pentanes, 3 of 2-; Two (4-hydroxy phenyl) pentanes, 1 of 3-, 1-bis(4-hydroxyphenyl)cyclohexane, 1, two (4-the hydroxy phenyl)-4-isopropyl cyclohexanes, 1 of 1-, 1-(4-hydroxy phenyl)-3; 3,5-trimethyl-cyclohexane, 1,1 '-two-(4-hydroxy phenyl)-adjacent diisopropyl benzene, 1; 1 '-two-(4-hydroxy phenyl)-diisopropyl benzene, 1,1 '-two-(4-hydroxy phenyl)-to diisopropyl benzene, 1, two (the 4-hydroxy phenyls)-5 of 3-; 7-dimethyladamantane, 4,4 '-dihydroxydiphenylsulisomer, 4,4 '-dihydroxy diphenyl sulfoxide, 4; 4 '-dihydroxy diphenyl sulfide, 4,4 '-dihydroxy diphenylketone, 4,4 '-dihydroxy diphenyl ether, 4; 4 '-dihydroxy diphenyl, 1, two (4-the hydroxy phenyl)-2-methylpropanes and 2 of 1-, two (4-the hydroxy phenyl)-4-methylpentanes of 2-etc.These can use separately or use mixing more than 2 kinds.

As carbonate precursor, can enumerate carboxylic acid halides, carbonic ester or haloformate etc.Can enumerate the bishaloformate of phosgene, diphenyl carbonate or dihydric phenol etc. particularly.Preferred especially phosgene or diphenyl carbonate.Adopt interfacial polymerization or melt phase polycondensation to make dihydric phenol and during the manufacturing polycarbonate, can use catalyzer, terminal terminator as required and be used to prevent the anti-oxidant of dihydric phenol oxidation with the carbonate precursor reaction.

Adopting the reaction of interfacial polymerization is the reaction of dihydric phenol photoreactive gas, reaction in the presence of acid binding agent and organic solvent.As acid binding agent, use for example amines such as alkali metal hydroxide such as NaOH, potassium hydroxide or pyridine.As organic solvent, use for example halogenated hydrocarbons such as methylene chloride, chlorobenzene.In addition, in order to promote reaction, also can use for example catalyzer such as tertiary amines such as triethylamine, tetra-n-butyl ammonium bromide, tetra-n-butyl phosphonium bromide, quaternary ammonium compound 、 quaternary phosphonium compound.At this moment, preferred 0～40 ℃ usually of temperature of reaction, in preferred about 10 minutes～5 hours of reaction time, the pH in the reaction preferably remains on more than 9.

(terminal terminator)

In addition, in the polyreaction, use terminal terminator usually.As this end terminator, can use the simple function phenols.In order to regulate molecular weight, generally use the simple function phenols as terminal terminator, in addition, the end of the polycarbonate that obtains is by the group end capping based on the simple function phenols, therefore with do not have comparing of end-blocking, excellent heat stability.As this simple function phenols, can be as the simple function phenols of the terminal terminator use of polycarbonate, the mono-functional phenols of representing as the formula of phenol or low alkyl group fortified phenol generally can be shown.

(in the formula, A representes the straight chain of hydrogen atom or carbon number 1～9 or the alkyl or aryl alkyl of branch, and r representes 1～5, preferred 1～3 integer.)

As the concrete example of simple function phenols, for example can enumerate phenol, p-t-butyl phenol, to cumyl phenol and isooctyl phenol.

In addition, as other mono-functional phenols, can use alkyl with long-chain or aliphatics ester group alkyl carboxyl acyl chloride class as substituent phenols or chlorobenzoyl chloride class or long-chain.If use these end-capped with Copolycarbonate, they also improve the melt fluidity of resin not only as terminal terminator or molecular weight regulator performance function, and processing and forming becomes easily, and also improves as the characteristic of substrate.The effect that particularly has the water-intake rate that reduces resin, the preferred use.These mono-functional phenols are represented by formula [I-a]～[I-h].

In various, X is-R-O-,-R-CO-O-or-R-O-CO-.Wherein, R representes singly-bound or carbon number 1～10, preferred 1～5 divalence aliphatic alkyl.T representes singly-bound or the bonding same with X.N representes 10～50 integer.

Q representes halogen atom or carbon number 1～10, preferred 1～5 univalent aliphatic series alkyl.P representes 0～4 integer.Y representes carbon number 1～10, preferred 1～5 divalence aliphatic alkyl.W ¹For hydrogen atom ,-CO-R ¹³,-CO-O-R ¹⁴Or R ¹⁵Wherein, R ¹³, R ¹⁴And R ¹⁵Represent carbon number 1～10, preferred 1～5 univalent aliphatic series alkyl separately; Carbon number 4～8, preferred 5～6 monovalence alicyclic alkyl or carbon number 6～15, preferred 6～12 monovalence aromatic hydrocarbyl.

L representes 4～20, preferred 5～10 integer.M representes 1～100, preferred 3～60, preferred especially 4～50 integer.Z representes singly-bound or carbon number 1～10, preferred 1～5 divalence aliphatic alkyl.W ²The expression hydrogen atom; Carbon number 1～10, preferred 1～5 univalent aliphatic series alkyl; Carbon number 4～8, preferred 5～6 monovalence alicyclic alkyl or carbon number 6～15, preferred 6～12 monovalence aromatic hydrocarbyl.

The substituted benzene phenols of [I-a] and [I-b] wherein, especially preferably.As the substituted benzene phenols of this [I-a], preferred n is 10～30, particularly 10～26 fortified phenol.As its concrete example, can enumerate decyl phenol, dodecyl phenol, myristyl phenol, cetyl phenol, octadecyl phenol, eicosyl phenol, docosyl phenol and melissyl phenol etc.

In addition, as the substituted phenol of [I-b], X is-R-CO-O-, and R is that the compound of singly-bound is fit to, and n is that 10～30, particularly 10～26 compound is preferred.As its concrete example, can enumerate hydroxybenzoic acid ester in the last of the ten Heavenly stems, hydroxybenzoic acid dodecyl ester, hydroxybenzoic acid myristyl ester, hydroxybenzoic acid cetyl ester, hydroxybenzoic acid eicosyl ester, hydroxybenzoic acid docosyl ester and hydroxybenzoic acid melissyl ester.

In substituted phenol shown in formula [I-a]～[I-g] or the substituted benzoyl chloride, the general preferred contraposition in substituent position or ortho position, preferably the two potpourri.

For the simple function phenols, with respect to whole ends of the PC that obtains (I), preferably import at least 5 moles of %, preferred at least 10 moles of % ends, in addition, the simple function phenols can separately or mix more than 2 kinds and use.

Utilize the reaction of melt phase polycondensation, the ester exchange reaction of dihydric phenol and carbonic ester is representational reaction, and the following heating of the existence dihydric phenol that is employed in inert gas mixes with the carbonic ester limit, and the method that the alcohol or the phenol of generation distillates is carried out.Temperature of reaction is different because of the alcohol of generation or the boiling point of phenol etc., but is generally 120～350 ℃ scope.The reaction later stage reduces pressure 1 with system, about 300Pa～13Pa (10～0.1 holder), makes the alcohol of generation or distillating of phenol become easy.Reaction time was generally about 1～4 hour.

As carbonic ester, can enumerate the ester of the aryl that can have substituent carbon number 6～10, the aralkyl of carbon number 6～10 or the alkyl of carbon number 1～4 etc.Can enumerate diphenyl carbonate, carboxylol ester, two (chlorphenyl) esters of carbonic acid, carbonic acid m-tolyl ester, carbonic acid dinaphthyl ester, two (xenyl) esters of carbonic acid, dimethyl carbonate, diethyl carbonate, dibutyl carbonate etc. particularly, wherein preferred diphenyl carbonate.

In addition, in order to improve polymerization speed, can use polymerization catalyst.As polymerization catalyst, can enumerate the catalyzer that the acylate, zinc compound, boron compound, silicon compound, germanium compound, organo-tin compound, lead compound, antimonial, manganese compound, titanium compound, zirconium compounds etc. of the alkoxide of for example oxyhydroxide, alkali metal salt, alkali earth metal salt, quaternary ammonium salt, alkaline metal or the alkaline-earth metal of oxyhydroxide, boron or the aluminium of alkali-metal oxyhydroxide such as NaOH or potassium hydroxide, alkaline-earth metal, alkali-metal acylate, alkaline-earth metal use usually in esterification or ester exchange reaction.Catalyzer can use separately, also can combination more than 2 kinds be used.The use amount of these polymerization catalysts is with respect to 1 mole of the dihydric phenol of raw material, preferably 1 * 10 ^-9～1 * 10 ^-5Equivalent, more preferably 1 * 10 ^-8～5 * 10 ^-6Select in the scope of equivalent.

In addition, in this polyreaction,, preferably after the later stage or end of polycondensation reaction, add for example 2-chlorphenyl benzol carbonate, 2-methoxycarbonyl phenyl carbonic ester, 2-ethoxy carbonyl phenyl carbonic ester etc. in order to reduce the end group of phenol property.Especially preferably use 2-methoxycarbonyl phenyl carbonic ester.

And then, the preferred deactivator that uses the activity of such catalysts neutralization in melt transesterification process.As the amount of this deactivator,, preferably use with 0.5～50 mole ratio with respect to 1 mole of remaining catalyzer.In addition, with respect to the polycarbonate after the polymerization, with the ratio of 0.01～500ppm, more preferably the ratio of ratio, the preferred especially 0.01～100ppm of 0.01～300ppm is used.As deactivator, preferably enumerate dodecylbenzene sulfonic acid Si Ding phosphonium salt ammonium salts such as phosphonium salt, etamon dodecylbenzyl sulfate etc.For the details of the reaction formation beyond above-mentioned, known in various documents and patent gazette etc.

(manufacturing of resin granular material)

For PC (I), be lens if consider its application target, preferably after adopting known in the past conventional method (solution polymerization process, melt phase polycondensation etc.) to make, under molten condition, carry out filtration treatment, impurity such as unreacted component, foreign matter are removed.And then, the partical polycarbonate that obtains being used for supplying with injection moulding (comprising injection compression molding) extrude operation (granulating working procedure), also preferably when molten condition, foreign matter is removed through sintered metal filter etc.As filtrator, preferably use the filtrator below the filtering accuracy 10 μ m.In a word, the preceding material resin of injection moulding (comprising injection compression molding) must reduce the content of foreign matter, impurity, solvent etc. in advance with doing one's utmost.

In addition; In order to make the pellet of this low foreign matter; Except above-mentioned; Preferably manufacturing installations such as extruder, granulating machine are arranged under the air atmosphere of cleaning, the chilled water that cooling bath is used becomes the few chilled water of foreign matter amount, and with the air etc. of cleaning more be full of raw material feeding hopper, supply with stream and the hold-up tank of the pellet that obtains etc.For example, employing is fit to the special identical method of method that proposes in the flat 11-21357 communique of opening.In addition, making with nitrogen is the method for covering oxygen in the inert gas inflow extruder of representative, as the improvement means of tone, also is fit to utilize.

In addition; In the manufacturing of this pellet; Can use the whole bag of tricks that has proposed, suitably carry out the distribution of shapes of pellet narrow and smallization, mistake cut substrate further minimizing, transportation or the micro powder that produces when carrying further minimizing and in the minimizing of tow or the inner bubble (bubbles of vacuum) that produces of pellet.The reduction of the bad generation ratio that the height circulationization that can further carry out moulding by these disposal routes and crazing are such.

In addition, the shape of pellet can be cylinder, square column and general shape such as spherical, more preferably cylinder (comprising cylindroid).The diameter of this cylinder is preferably 1～5mm, and more preferably 1.5～4mm further is preferably 2～3.3mm.Minor axis is preferably more than 60% with respect to the ratio of major diameter in the cylindroid, more preferably more than 65%.On the other hand, the length of cylinder is preferably 1～30mm, and more preferably 2～5mm further is preferably 2.5～3.5mm.

(phosphorus is stabilizing agent)

PC (I) can be being that the ratio of 0.0001～0.05 weight % contains at least a phosphorus compound that is selected from phosphoric acid, phosphorous acid, phosphonic acids, phosphonous acid and their ester with respect to PC (I).Through cooperating this phosphorus compound, the thermal stability of PC (I) improves, the reduction of the molecular weight when preventing moulding, the deterioration of tone.

As phosphorus compound, can enumerate at least a phosphorus compound that is selected from phosphoric acid, phosphorous acid, phosphonic acids, phosphonous acid and their ester.Preferably be selected from least a phosphorus compound in following formula (1)～(4).

Wherein, R ¹～R ¹²The alkyl of representing carbon numbers 1～20 such as hydrogen atom, methyl, ethyl, propyl group, isopropyl, butyl, isobutyl, the tert-butyl group, amyl group, hexyl, heptyl, octyl group, nonyl, decyl, dodecyl, cetyl, octadecyl independently of one another; The aryl or the benzyl of carbon numbers 6～15 such as phenyl, tolyl, naphthyl; The aralkyl of carbon numbers such as phenethyl 7～18.In addition, when having 2 alkyl in 1 compound, these two alkyl can mutually combine and form ring.

As the phosphorus compound shown in the formula (1); Can enumerate triphenyl phosphite, Wytox 312, tricresyl phosphite (2; The 4-di-tert-butyl-phenyl) ester, tridecyl phosphite, tricresyl phosphite monooctyl ester, tricresyl phosphite (octadecyl) ester, phosphorous acid didecyl list phenylester, phosphorous acid dioctyl list phenylester, phosphorous acid diisopropyl list phenylester, phosphorous acid monobutyl diphenyl, phosphorous acid list decyl diphenyl, phosphorous acid list octyl group diphenyl, two (2; 6-di-t-butyl-4-aminomethyl phenyl) pentaerythritol diphosphites, 2; 2-di-2-ethylhexylphosphine oxide (4; The 6-di-tert-butyl-phenyl) octyl group phosphite ester, two (nonyl phenyl) pentaerythritol diphosphites, two (2; The 4-di-tert-butyl-phenyl) pentaerythritol diphosphites, two (2, the 4-dicumylphenyl) pentaerythritol diphosphites, distearyl pentaerythrityl diphosphite etc.As the phosphorus compound of above-mentioned formula (2) expression, can enumerate for example tributyl phosphate, trimethyl phosphate, triphenyl phosphate, triethyl phosphate, the adjacent biphenyl ester of di(2-ethylhexyl)phosphate phenyl list, dibutylphosphoric acid ester, dioctylphosphoric acid ester, diisopropyl phosphate etc.As the phosphorus compound shown in the above-mentioned formula (3), can enumerate four (2, the 4-di-tert-butyl-phenyl)-4,4-biphenylene phosphinate etc.In addition, as the compound of above-mentioned formula (4) expression, can enumerate phenyl-phosphonic acid dimethyl ester, phenyl-phosphonic acid diethylester and phenyl-phosphonic acid dipropyl etc.Wherein, preferably use distearyl pentaerythrityl diphosphite, triethyl phosphate, phenyl-phosphonic acid dimethyl ester, two (2, the 4-dicumylphenyl) pentaerythritol diphosphites.

The content of this phosphorus compound with respect to PC (I), is preferably 0.0001～0.05 weight %, and more preferably 0.0005～0.02 weight % further is preferably 0.001～0.01 weight %.If content is difficult to obtain above-mentioned effect less than 0.0001 weight %, if surpass 0.05 weight %, oppose that mutually the thermal stability of PC (I) has a negative impact, and hydrolytic resistance reduces also, therefore not preferred.

(anti-oxidant)

For anti-oxidation, PC (I) can contain anti-oxidant.As anti-oxidant, can enumerate phenol is that anti-oxidant, lactone are anti-oxidant.As phenol is anti-oxidant, can enumerate for example triethylene glycol-two (3-(the 3-tert-butyl group-5-methyl-4-hydroxy phenyl) propionic esters), 1 particularly, and (3-(3 for 6-hexanediol-two; 5-two-tert-butyl-hydroxy phenyl) propionic ester), pentaerythrite-four (3-(3,5-two-tert-butyl-hydroxy phenyl) propionic ester), octadecyl-3-(3,5-two-tert-butyl-hydroxy phenyl) propionic ester, 1; 3,5-trimethyl-2,4; 6-three (3, the 5-di-tert-butyl-4-hydroxyl benzyl) benzene, N, N-hexa-methylene two (3; 5-di-t-butyl-4-hydroxyl-hydrocinnamamide), 3,5-di-t-butyl-4-hydroxyl-benzylphosphonic acid ester-diethyl ester, three (3, the 5-di-tert-butyl-4-hydroxyl benzyl) isocyanuric acid ester, 3; Two { 1,1-dimethyl-2-[β-(3-tertiary butyl-4-hydroxy-5-aminomethyl phenyl) propionyloxy] ethyl }-2,4 of 9-; 8,10-four oxaspiros (5,5) undecane etc.

In addition, be anti-oxidant as lactone, can enumerate 5,7-di-t-butyl-3-(3, the 4-3,5-dimethylphenyl)-3H-benzofuran-2-ones, 5,7-di-t-butyl-3-(2, the 3-3,5-dimethylphenyl)-3H-benzofuran-2-ones etc.The content of these anti-oxidants with respect to Copolycarbonate, is 0.0001～0.05 weight %.

(release agent)

The high-grade aliphatic ester that PC (I) can contain monobasic or polyvalent alcohol is as release agent.Through cooperating the high-grade aliphatic ester of monobasic or polyvalent alcohol, the release property from mould during PC (I) moulding improves, and in the moulding of optics, ejection load is little, can prevent the distortion by the moulding article of the bad generation of the demoulding.In addition, the advantage that also has the melt fluidity of improving PC (I).

As this high-grade aliphatic ester, the partial ester of the monobasic of preferred carbon number 1～20 or the saturated fatty acid of polyvalent alcohol and carbon number 10～30 or full ester.

In addition; Partial ester or full ester as this monohydroxy alcohol or polyvalent alcohol and saturated fatty acid; Glyceryl monostearate, stearic acid list sorbitol ester, docosanoic acid monoglyceride, pentaerythritol monostearate, pentaerythritol tetrastearate, propylene glycol monostearate, stearic acid stearyl ester, palmitic acid palm ester, butyl stearate, methyl laurate, isopropyl palmitate, stearic acid 2-Octyl Nitrite etc. be can enumerate, glyceryl monostearate, pentaerythritol tetrastearate wherein preferably used.

The content of release agent is preferably 0.01～2 weight % with respect to PC (I), and more preferably 0.015～0.5 weight % further is preferably 0.02～0.2 weight %.If content can't obtain above-mentioned effect less than 0.01 weight %, if surpass 2 weight %, the reason that die surface pollutes when becoming moulding.

In the scope of not damaging thermotolerance, the transparency, can further contain adjuvants such as light stabilizer, colorant, antistatic agent, lubricant among the PC (I).In Copolycarbonate, during additive package, can adopt arbitrary method to implement.Method of mixing is carried out in suitable use for example rotary drum mixer, V-type mixing machine, nauta mixer, banbury mixers, mixing roller, extruder etc.

(specific viscosity)

For PC (I), its 0.7g is dissolved in the methylene chloride of 100ml, be preferably 0.17～0.55 20 ℃ of specific viscosities of measuring down, more preferably 0.21～0.45 scope.If specific viscosity is less than 0.17, the moulding article become fragile, if than 0.55 height, melt viscosity and solution viscosity raise, and handle the difficulty that becomes.

(glass transition temperature)

PC (I) is preferably 150 ℃～250 ℃, more preferably 160～245 ℃ at 20 ℃ of/minute glass transition temperatures (Tg) of measuring down of programming rate.If Tg is below 150 ℃, because of the difference of the use of using the optics that PC (I) forms, thermotolerance is not enough sometimes, and on the other hand, if Tg is more than 250 ℃, melt viscosity raises, the moulding difficulty that becomes.

(photoelastic coefficient)

The photoelastic coefficient of PC (I) is preferably 45 * 10 ¹³Cm ²Below/the dyne, more preferably 40 * 10 ¹³Cm ²Below/the dyne.Photoelastic coefficient is than 45 * 10 ¹³Cm ²When/dyne was big, the shaping and deformation that produces during moulding increased, and used the difficulty that becomes as optics.

(orientation birefringence rate)

The absolute value of the orientation birefringence rate that the method that PC (I) states after adopting is measured is preferably less than 1.0 * 10 ^-3, be more preferably less than 0.5 * 10 ^-3If have the birefringence value in this scope, the birefringence that is caused by orientation diminishes, and for opticses such as lens, no picture quality reduces, and obtains high-resolution.

(water-intake rate)

PC (I) is immersed in φ 45mm profiled sheeting in the water according to ASTM D-570, and the water-intake rate after obtained by weight rate (weight %) 24 hours is preferably below 0.25%.When bigger than 0.25%, the change in size of the lens that produce owing to absorbing water produces picture quality and reduces, and is therefore not preferred.

(Abbe number)

PC (I) the preferably refractive index under 589nm is 1.600～1.650.The preferred Abbe number of PC (I) is 20～35.Preferably the refractive index under 589nm is 1.600～1.650 to PC (I), Abbe number is 20～35.More preferably the refractive index under 589nm is 1.610～1.650 to PC (I), Abbe number is 20～30.Refractive index under the 589nm and Abbe number use light source to have the Abbe refractometer of wavelength selective filters according to JIS-K7142, are C line (656nm), D line (589nm), F line (486nm) mensuration refractive index with wavelength shift, are obtained according to following formula by the value that obtains.

${\mathrm{\&upsi;}}_D=\frac{n_D-1}{n_F-n_C}$

υ _D: Abbe number

n _D: for the refractive index of the light of wavelength 589nm

n _F: for the refractive index of the light of wavelength 486nm

n _C: for the refractive index of the light of wavelength 656nm

(lens)

Lens of the present invention are meant as becoming pickup lens, camera lens, microarray lens, projection lenses and the Fresnel lens etc. of optical device with the optical element of parts.Specifically, be meant to have two spheres or aspheric refractive surface, make light transmissive lens,, do not have special qualification as long as satisfy this point as lens.Can enumerate for example kinds such as spherical lens, non-spherical lens, imaging lens system, camera lens, microarray lens, projection lenses and Fresnel lens.

Lens of the present invention are by moulding such as injection moulding, compression forming method, injection compression molding method, extrusion moulding, solution casting methods.From the easy property and the cost aspect of moulding, especially preferably adopt injection moulding or the moulding of injection compression molding method.

(light transmittances of lens)

Lens of the present invention, being preferably the total light transmittance of template under 550nm is more than 80%.More preferably more than 85%.If transmissivity is lower than 80%, be difficult to use as optics.

(birefringences of lens)

In addition, lens of the present invention are designated as Re with the length of delay (retardation) of profiled sheeting under 550nm ₅₅₀(nm), when the thickness of the location of transmissivity and length of delay is designated as d (mm), preferably satisfy:

Re ₅₅₀(nm)/d(mm)≤10×10 ^-6

The length of delay of the optical element of being processed by the polycarbonate of general bisphenol A-type is big.Because of the difference of condition of molding, this value is reduced, but its condition and range is very little usually, so moulding become very difficult, in most cases can not satisfy above-mentioned formula.PC among the present invention (I), the length of delay that produces because of the orientation of resin is little, and shaping and deformation is also little, even therefore molding condition imprecisely also can obtain the good optical element.

< optical unit >

It is 45～60 lens that optical unit of the present invention comprises as the lens of being processed by above-mentioned PC (I) of the 1st lens and as the Abbe number of the 2nd lens.The Abbe number of the 2nd lens is preferably 50～60.

As the 2nd lens,, obtain to revise the effect of chromatic aberation through the lens that Abbe number is different and birefringence is low of use with the lens of processing by PC (I).1st, the birefringence of the 2nd lens, the plano-convex lens of preferred thick 0.8mm is below the 100nm by the phase differential that vertical incidence produces.

As the 2nd lens, preferably by ester ring type polyolefin, polymethylmethacrylate, alkene-maleimide copolymer, gather the lens that process (1, the 3-cyclohexadiene).Preferred especially ester ring type polyolefin resin.

As the ester ring type polyolefin resin, the ester ring type polyolefin resin that the multipolymer of disclosed ethene and cycloolefin was processed during disclosed ester ring type polyolefin resin, the spy of containing the ENB system of methacryl opened 2001-26693 number etc. during ester ring type polyolefin resin, the spy that specifically can enumerate disclosed ENB system in the special table 2001-072870 grade opened 2004-51949 number etc.In addition, as commercially available article, can enumerate the ZEONEX (registered trademark) of Nippon Zeon Co., Ltd.'s system, the ARTON (registered trademark) of JSR Corp.'s system, the APEL (registered trademark) of Mitsui Chemicals, Inc's system etc.

The preferred refractive index of ester ring type polyolefin under wavelength 589nm (Na-D line) is 1.450～1.550, and Abbe number is 45～60.

Require miniaturization and, cost to reduce the incorporate optical unit of a plurality of lens with support, be fit to use plastic lens.Particularly use the good ester ring type polyolefin of optical characteristics.But, when using the lens of processing by the ester ring type polyolefin to form optical unit, need carry out optical design with the incompatible correction chromatic aberation of processing by the remarkable different starting material of Abbe number of lens combination.The polyolefinic Abbe number of ester ring type is about 45～60, therefore can be fit to use the lens of being processed by the low PC of Abbe number (I).

Optical unit of the present invention, for example, the birefringence that the orientation when offsetting injection moulding produces can be assembled under the state of the combinations of directions of having set a plurality of lens in the support of tubular and make.In addition; Entirety of lens package is added new stress in support the time; For example if to be adhesively fixed then be the stress that the cure shrinkage with bonding agent accompanies, and, produce new birefringence based on this stress if embedding fixing then is the fixed stress that is produced by support.Therefore; Also can utilize respectively the support that forms configuration the 1st lens and the support of configuration the 2nd lens, a side support and the opposing party's support are connected, the optical axis of following with a side of support makes its rotation as turning axle; After the orientation birefringence counteracting, two stands is connected fixed method.

It is 45～60 plastic lens that optical unit preferably comprises a plurality of Abbe numbers.The optical unit that optical unit of the present invention can be suitable as mobile phone, digital camera etc. uses.

Embodiment

Below enumerate the embodiment detailed description, but the present invention only otherwise exceed its purport, never is limited to this." part " is weight portion in embodiment and the comparative example.Have again, estimate and carry out according to following method.

(1) specific viscosity

Polymkeric substance 0.7g is dissolved in the methylene chloride of 100ml, under 20 ℃ temperature, measures.

(2) glass transition temperature (Tg)

Use TAInstruments Japan (strain) corporate system 2910 type DSC, measure for 20 ℃/minute with programming rate.

(3) water-intake rate

Polycarbonate resin 4.0g is dropped in the mould of 45mm φ, in the compacting shape machine of 280 ℃ of temperature, keep after 1 minute, cool to room temperature under the state of pressurization obtains 45mm φ and is compressed into template., according to ASTM D-570, φ 45mm be compressed into template impregnated in the water of temperature 23 ℃ 24 hour, measure water-intake rate by the weight rate (weight %) before and after the dipping thereafter.

(4) photoelastic coefficient

5g is dissolved among the methylene chloride 100ml with Copolycarbonate (I) pellet, and this solution casting to smooth glass plate, is placed an evening, makes casting films.This film after 2 hours, is made the film of long 50mm, wide 20mm, average thickness 150 μ m 60 ℃ of dryings, the photoelasticity platform is installed to Japanese beam split corporate system ellipsometer M-220, measure.Condition determination is measured the phase differential of this moment for film is added the load below the 1N.Mensuration is carried out 5 points, calculates photoelastic coefficient by following calculating formula.

Re＝F×c×d

Re: phase differential [nm]

F: stress [N/m ²]

C: photoelastic constant [m ²/ N]

D: thickness [nm]

(5) Abbe number

Use the casting films of making in above-mentioned (4); According to JIS-K7142; Using light source to have the Abbe refractometer of wavelength selective filters, is C line (656nm), D line (589nm), F line (486nm) mensuration refractive index with wavelength shift, uses the detecting refractive index Abbe number that obtains.

(6) orientation birefringence rate

(I) is dissolved in the methylene chloride with Copolycarbonate, and to smooth glass plate, the thickness deviation of making average thickness 60 μ m, Width is the film of 1.1 μ m with the dichloromethane solution curtain coating of 15 weight %.The end of the film that obtains is cut, become wide 10mm, long 100mm, in order to remove dichloromethane solution, that this film is following dry 2 hours at 120 ℃.Under regulation draft temperature (glass transition temperature+10 ℃), with draw speed 15mm/min the film that obtains is carried out uniaxial tension along its length, obtain 2 times of stretched film of wide 7.1mm, average thickness 42 μ m, long 200mm.Use polaroid that this film is observed, results verification is with its even stretching.Then, the birefringence platform is installed to Japanese beam split corporate system ellipsometer (model: M-220), measure phase differential.By the phase differential that obtains, calculate the orientation birefringence rate according to following formula.

Δn×10 ^-3＝Ret/d

Δ n: orientation birefringence rate

Ret: phase differential [nm]

D: film thickness [μ m]

(7) total light transmittance (%T)

Use the system injection (mo(u)lding) machine N-20C of JSW, the matrix band of the thick 1.0mm of injection moulding, wide 1.0mm, long 2.0mm.Use the total light transmittance of Hitachi's system U-4001 type spectrophotometric determination matrix band under 550nm.

(8) phase differential (Re ₅₅₀)

Use Japanese beam split corporate system M-220 type ellipsometer to measure the vertical incidence birefringence of matrix band under 550nm of making in above-mentioned (7).

(9) the birefringence evaluation of plano-convex lens

Use the system injection (mo(u)lding) machine N-20C of JSW, at the plano-convex lens of the condition of molding injected moulding external diameter 2.0mm shown in the table 2, the thick 0.8mm in center, focal length 2.0mm.For the product of moulding, use prince's instrumentation machines corporation system, small area measuring difference of phases device KOBRA-CCD, measure the phase differential of the core under the wavelength 590nm.

(10) making of optical unit

Make optical unit shown in Figure 1 by following main points.The 1st lens (1) are made in Copolycarbonate (I) injection moulding.With ester ring type polyolefin (Nippon Zeon Co., Ltd.'s system, trade name ZEONEX ^TM480R) the 2nd lens (2) are made in injection moulding.The 1st lens (1) are assembled into the 1st support (3), the 2nd lens (2) are assembled into the 2nd support (4).Formation is with the structure of the 1st support (3) and the 2nd support (4) joint.With optical axis (6) is that central shaft is rotated, thereby after making the combination, optical characteristics optimization of 2 lens (1), (2), connects fixing and integrated with bonding agent.The state of the lens unit that obtains is focal length 5.8mm, F value 2.0, receive light size diameter 7.2mm, lens total length 15.4mm, lens diameter 14mm.

(11) evaluation of lens unit

In the evaluation system shown in Fig. 2; Lens unit (7) is installed to Acutelogic corporate system MTF (modulation transfer function; Modulation Transfer Function) determination unit (8); According to the exploring degree assay method of ISO12233 record, evaluation is carried out image analysis with the spatial frequency characteristic among 10/mm and the 30/mm in the image (11) and measure with computing machine (9).In the MTF characteristic, be that 10/mm approaches that 1 such contrastive feature is good, 30/mm approaches 1 such lens that possess high resolution capability.

Embodiment 1

(synthesizing of Copolycarbonate (I))

In the reactor that has thermometer, stirring machine and reflux cooler; Pack into 69.1 parts of 48% sodium hydrate aqueous solutions and 301.6 parts of ion exchange waters; Dissolve 9 therein, behind 51.5 parts of two (4-hydroxy-3-methyl phenyl) fluorenes of 9-, 1,0.15 part of 23.9 parts of two (4-hydroxy phenyl) decane of 1-and sodium hydrosulfite (Ha イ De ロ サ Le Off ア イ ト); Add 231.5 parts of methylene chloride, stir down at 15～25 ℃ down with being blown into 28.0 parts in phosgene in about 60 minutes.After phosgene is blown into end, add 1.41 parts of 8.6 parts of 48% sodium hydrate aqueous solutions and p-t-butyl phenols, begin once more to stir, add 0.07 part of triethylamine after the emulsification, and then stirred 1 hour down, make to react and finish at 28～33 ℃.After reaction finished, with after the product dilution and washing, washing became hydrochloric acid acidity with methylene chloride, and repeated water washing is roughly the same until the conductivity and the ion exchange water of water again, obtains the dichloromethane solution of Copolycarbonate (I).

Then; Make the filtrator of this solution through mesh 0.3 μ m, splash into bearing portion again and have in the warm water in the kneader of band insulated chamber of foreign matter conveying end, trimming is heated up in a steamer with methylene chloride in the limit makes Copolycarbonate (I) sheet; Then will contain the pulverizing of liquid thin slice, drying, obtain powder.In this powder, add two (2, the 4-dicumylphenyl) pentaerythritol diphosphites 0.050%, pentaerythritol tetrastearate 0.10%, use the φ 30mm single screw extrusion machine of band blow vent, carry out granulation.(BCF: DED=65 mole %: physics value 35 moles of %) is shown in table 1 with the Copolycarbonate that obtains (I).

(matrix band)

Then, drying is after 5 hours down at 120 ℃, and the system injection (mo(u)lding) machine N-20C of use JSW is at the matrix band of the thick 1.0mm of the described condition of molding injected of table 2 moulding, wide 1.0mm, long 2.0mm.Measure total light transmittance and the birefringence of matrix band under 550nm, be shown in table 2.

(lens)

In addition, use identical pellet, identical make-up machine, at the plano-convex lens of the condition of molding injected moulding external diameter 2.0mm shown in the table 2, the thick 0.80mm in center, focal length 2.0mm.For the product of moulding, use prince's instrumentation machines corporation system small area measuring difference of phases device KOBRA-CCD, measure the phase differential under the wavelength 590nm, the result is shown in table 3.

(optical unit)

The lens that use is processed by Copolycarbonate (I) use by ester ring type polyolefin (Nippon Zeon Co., Ltd.'s system, trade name ZEONEX as the 1st lens (1) ^TMThe lens of 480R) processing (Abbe number 56) are made optical unit as the 2nd lens (2).The 1st lens (1) are assembled into the 1st support (3), the 2nd lens (2) are assembled into the 2nd support (4).Formation is with the structure of the 1st support (3) and the 2nd support (4) joint.With optical axis (6) is that central shaft is rotated, thereby after making the combination, optical characteristics optimization of 2 lens (1), (2), connects fixing and integrated with bonding agent.

The state of the optical unit that obtains is focal length 5.8mm, F value 2.0, receive light size diameter 7.2mm, lens total length 15.4mm, lens diameter 14mm.Optical unit is installed to Acutelogic corporate system MTF (Modulation Transfer Function) determination unit (8), with the spatial frequency characteristic in the image (11), the result is shown in table 4 according to the exploring degree assay method evaluation of measuring of ISO12233 record.

Embodiment 2

Except becoming 9; 55.4 parts of two (4-hydroxy-3-methyl phenyl) fluorenes of 9-, 1; Two (4-hydroxy phenyl) decane 20.5 of 1-all likewise obtain having the pellet (BCF: DED=70 mole %: 30 moles of %) of the Copolycarbonate (I) of the characteristic that table 1 puts down in writing especially with embodiment 1.In addition,, likewise estimate, the result is shown in table 2 and table 3 in the lump with embodiment 1 except the condition of molding compacted under matrix band and plano-convex lens of table 2 and table 3 record.

In addition, above-mentioned Copolycarbonate (I) is used for the 1st lens (1), with ester ring type polyolefin (Nippon Zeon Co., Ltd.'s system, trade name ZEONEX ^TM480R) be used for the 2nd lens (2), make optical unit (Abbe number 56) shown in Figure 1 through injection moulding.The optical unit of making is installed to Acutelogic corporate system MTF (Modulation Transfer Function) determination unit (8); With the spatial frequency characteristic in the image (11), the result is shown in table 4 according to the exploring degree assay method evaluation of measuring of ISO12233 record.

Embodiment 3

Except becoming 9; 59.4 parts of two (4-hydroxy-3-methyl phenyl) fluorenes of 9-, 1; Two (4-hydroxy phenyl) decane 17.1 of 1-all likewise obtain having the pellet (BCF: DED=75 mole %: 25 moles of %) of the Copolycarbonate (I) of the characteristic that table 1 puts down in writing especially with embodiment 1.In addition,, likewise estimate, the result is shown in table 2 and table 3 in the lump with embodiment 1 except the condition of molding compacted under matrix band and plano-convex lens of table 2 and table 3 record.In addition, above-mentioned Copolycarbonate (I) is used for the 1st lens (1), with ester ring type polyolefin (Japanese Rui Weng society system, trade name ZEONEX ^TM480R) be used for the 2nd lens (2), make optical unit (Abbe number 56) shown in Figure 1 through injection moulding.The optical unit of making is installed to Acutelogic corporate system MTF (Modulation Transfer Function) determination unit (8); With the spatial frequency characteristic in the image (11), the result is shown in table 4 according to the exploring degree assay method evaluation of measuring of ISO12233 record.

Comparative example 1

Except becoming 9,31.7 parts of two (4-hydroxy-3-methyl phenyl) fluorenes of 9-, 1, two (4-hydroxy phenyl) decane 41.0 of 1-all likewise obtain having the pellet of the Copolycarbonate of the characteristic that table 1 puts down in writing especially with embodiment 1.In addition,, likewise estimate, the result is shown in table 2 and table 3 in the lump with embodiment 1 except the condition of molding compacted under matrix band and plano-convex lens of table 2 and table 3 record.In addition, above-mentioned Copolycarbonate (I) is used for the 1st lens (1), with ester ring type polyolefin (Nippon Zeon Co., Ltd.'s system, trade name ZEONEX ^TM480R) be used for the 2nd lens (2), make optical unit (Abbe number 56) shown in Figure 1 through injection moulding.The optical unit of making is installed to Acutelogic corporate system MTF (Modulation Transfer Function) determination unit (8); With the spatial frequency characteristic in the image (11), the result is shown in table 4 according to the exploring degree assay method evaluation of measuring of ISO12233 record.

Comparative example 2

Except becoming 9,71.2 parts of two (4-hydroxy-3-methyl phenyl) fluorenes of 9-, 1, two (4-hydroxy phenyl) decane 6.8 of 1-all likewise obtain having the pellet of the Copolycarbonate of the characteristic that table 1 puts down in writing especially with embodiment 1.In addition,, likewise estimate, the result is shown in table 2 and table 3 in the lump with embodiment 1 except the condition of molding compacted under matrix band and plano-convex lens of table 2 and table 3 record.In addition, above-mentioned Copolycarbonate (I) is used for the 1st lens (1), with ester ring type polyolefin (Japanese Rui Weng society system, trade name ZEONEX ^TM480R) be used for the 2nd lens (2), make optical unit (Abbe number 56) shown in Figure 1 through injection moulding.The optical unit of making is installed to Acutelogic corporate system MTF (Modulation Transfer Function) determination unit (8); With the spatial frequency characteristic in the image (11), the result is shown in table 4 according to the exploring degree assay method evaluation of measuring of ISO12233 record.

Comparative example 3

Use is by 2; The polycarbonate (Supreme Being people changes into corporate system PANLITE AD-5503) that two (4-hydroxy phenyl) propane of 2-obtain, and then, at the condition of molding compacted under matrix band and the plano-convex lens of table 2 and table 3 record; In addition likewise estimate with embodiment 1, the result is shown in table 2 and table 3 in the lump.In addition, above-mentioned polycarbonate resin (I) is used for the 1st lens (1), with ester ring type polyolefin (Nippon Zeon Co., Ltd.'s system, trade name ZEONEX ^TM480R) be used for the 2nd lens (2), make optical unit (Abbe number 56) shown in Figure 1 through injection moulding.The optical unit of making is installed to Acutelogic corporate system MTF (Modulation Transfer Function) determination unit (8); With the spatial frequency characteristic in the image (11), the result is shown in table 4 according to the exploring degree assay method evaluation of measuring of ISO12233 record.

The effect of invention

Lens of the present invention, birefringence is little, has high index of refraction.Lens of the present invention, the transparency and excellent heat resistance.In addition, optical unit of the present invention, chromatic aberation obtains revising, and has high-resolution.

Optical unit of the present invention has the good optical characteristic, and the optical unit that therefore is suitable as mobile phone, digital camera etc. uses.

Claims (12)

1. an optical unit is characterized in that, comprises: lens of processing by Copolycarbonate (I) and be 45～60 lens by the Abbe number that (II) ester ring type polyolefin is processed,

The unit (B) that unit (A) that this Copolycarbonate (I) is represented by following formula and following formula are represented constitutes, and all the ratio of the unit (A) in the unit is 50～80 moles of %,

In the formula, R ¹～R ⁴Be the alkyl or the halogen atom of hydrogen atom, carbon number 1～9 independently of one another,

In the formula, R ⁵, R ⁶Represent the alkyl of hydrogen atom, carbon number 1～6, the aryl of carbon number 6～10 or the alkoxy of carbon number 1～6 independently of one another, R ⁷And R ⁸The alkyl of representing hydrogen atom or carbon number 1～9 independently of one another, wherein, R ⁷And R ⁸Carbon number add up to 9 or 10.

2. optical unit according to claim 1, wherein, the ratio of the unit (A) in whole unit of Copolycarbonate (I) is 65～75 moles of %.

3. optical unit according to claim 1, wherein, the unit (A) of Copolycarbonate (I) is by 9, the unit that two (the 4-hydroxy-3-methyl phenyl) fluorenes of 9-are derived.

4. optical unit according to claim 1, wherein, the unit (B) of Copolycarbonate (I) is by 1, the unit that two (4-hydroxy phenyl) decane of 1-are derived.

5. optical unit according to claim 1, wherein, the refractive index of Copolycarbonate (I) under the Na-D of wavelength 589nm line is 1.600～1.650.

6. optical unit according to claim 1, wherein, the Abbe number of Copolycarbonate (I) is 20～35.

7. optical unit according to claim 1, wherein, the refractive index of Copolycarbonate (I) under the Na-D of wavelength 589nm line is 1.600～1.650, Abbe number is 20～35.

8. optical unit according to claim 1, wherein, the birefraction of Copolycarbonate (I) is 0.3 * 10 ^-4～1 * 10 ^-4

9. optical unit according to claim 1, wherein, the refractive index of ester ring type polyolefin under the Na-D of wavelength 589nm line is 1.450～1.550, and Abbe number is 45～60.

10. optical unit according to claim 1 comprises a plurality of Abbe numbers and is 45～60 plastic lens.

11. optical unit according to claim 1 is used for mobile phone.

12. optical unit according to claim 1 is used for digital camera.

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